Berikan jawaban nya serta jalan nyax^2+8x16=0

x²+8x+16 = 0
x²+4x+4x+16 = 0
(x²+4x)+(4x+16) = 0
x(x+4)+4(x+4) = 0
(x+4)(x+4) = 0
(x+4)² = 0

nilai x :
x+4 = 0
x = -4